Connected: An Internet Encyclopedia
RFC 1123 - Security Considerations

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### Security Considerations

There are many security issues in the application and support programs of host software, but a full discussion is beyond the scope of this RFC. Security-related issues are mentioned in sections concerning TFTP (Sections 4.2.1, 4.2.3.4, 4.2.3.5), the SMTP VRFY and EXPN commands (Section 5.2.3), the SMTP HELO command (5.2.5), and the SMTP DATA command (Section 5.2.8).

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Connected: An Internet Encyclopedia
RFC 1123 - Security Considerations